They argued that the world's resources were limited and that population growth and development would be severely constrained by the year 2000 unless changes were made ( Ehrlich, 1968; Meadows & Meadows, 1972 as cited by Murphy 1998). The concept of sustainability was formalized in 1987 with the publication of Our Common Future, also known as the Brunndtaland Report, by the World Commission on Environment and Development (WCED). Sustainable development was defined in this report as “development that meets the needs of the present without compromising the ability of future generations to meet their own needs” (p. 43). Murphy (1998) identified 14 major components of sustainable development based on his interpretation of Our Common Future. A summary of these components has three general concepts which are environmental concepts, social concepts and economic concepts. From these concepts a general goal for sustainable development can be derived